CA2326274C - Anti-rotation clips - Google Patents
Anti-rotation clips Download PDFInfo
- Publication number
- CA2326274C CA2326274C CA002326274A CA2326274A CA2326274C CA 2326274 C CA2326274 C CA 2326274C CA 002326274 A CA002326274 A CA 002326274A CA 2326274 A CA2326274 A CA 2326274A CA 2326274 C CA2326274 C CA 2326274C
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- Prior art keywords
- clip
- rotation
- clips
- tang
- relative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000003780 insertion Methods 0.000 claims description 8
- 230000037431 insertion Effects 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 4
- 230000000452 restraining effect Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 2
- 238000009434 installation Methods 0.000 abstract description 2
- 230000007246 mechanism Effects 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B2/00—Friction-grip releasable fastenings
- F16B2/20—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening
- F16B2/22—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material
- F16B2/24—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal
- F16B2/241—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal
- F16B2/245—Clips, i.e. with gripping action effected solely by the inherent resistance to deformation of the material of the fastening of resilient material, e.g. rubbery material of metal of sheet metal external, i.e. with contracting action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/10—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt
- F16B39/101—Locking of screws, bolts or nuts in which the locking takes place after screwing down by a plate, spring, wire or ring immovable with regard to the bolt or object and mainly perpendicular to the axis of the bolt with a plate, spring, wire or ring holding two or more nuts or bolt heads which are mainly in the same plane
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L19/00—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts
- F16L19/005—Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on, or into, one of the joint parts comprising locking means for the threaded member
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Clamps And Clips (AREA)
Abstract
An anti-rotation clip is adapted to be attached to a fastener or connector assembly to ensure the tightened threaded connection of the assembly. The anti-rotation clip in one embodiment of the invention includes one or more co-axial clips to radially and forcibly grip one or more hexagonal parts rotatable to a body, and a pair of tang members extending from one clip to engage a pair of grooves having flat bottoms on the body to prevent the hexagonal parts from rotation and the clip from axially moving away relative to the body. In another embodiment of the invention, two co-axially connected clips are adapted to radially and forcibly grip two connectors, having hexagonal exteriors, which are in a tightly threaded connection to a body and may be loosened in opposite rotary directions. The two clips lock the two connectors together to prevent the loosening of either one. An axially spaced apart tang member restrains a flange member on the body to prevent the clip from displacement from its axial position. The anti-rotation clip is simple in structure, easy for use and no plastic deformation is required during installation so that stress concentration is avoided which is especially good for aerospace applications.
Description
ANTI-ROTATION CLIPS
TECHNICAL FIELD
The invention relates to fastening mechanisms and, in particular, to external secondary locking mechanisms to prevent the relative rotation and loosening of various separable connectors or fasteners, most commonly threaded connectors or fasteners.
BACKGROUND OF THE INVENTION
The secondary locking mechanisms to prevent the relative rotation and loosening of various separable connectors or fasteners have been developed over a long period of time, and different types of mechanisms have been created for various applications. In aerospace applications, anti-rotation features are important and external secondary locking mechanisms are widely used in different structures. In an assembly of rotating equipment such as gas turbine engine fans, for example, there are occasions where blind assembly of bolts would be required. In such situations, the head of the bolt cannot be reached at the time that components to be joined are installed, when applying a nut, or when tightening a nut. Various clips and retaining means are known to retain a bolt at such time. In other situations, external secondary locking mechanisms are used for locking connectors that join tubes, hoses and wiring together or to an accessory unit. The requirements for aerospace applications are particularly stringent, in particular, for use on engines, hydraulic systems, fuel systems and electrical cable connectors.
The current and most common means for secondary locking of aerospace connectors or fasteners are lock wires and safety wires which require special features to be incorporated in the connectors or fasteners. Other means comprise crimp nuts, fibre nuts and tab washers. These external locking devices may permit some small relative rotation of the connectors or fasteners, and usually are destroyed or rendered non-reusable in aerospace applications, once unlocked to open the connectors or unfasten the fasteners.
With high speed rotating equipment, high stresses are formed and notches, scratches or plastic deformation forms stress concentrations. Any such stress concentration can cause failure during the operation of the apparatus. It is therefore desirable that any external secondary locking mechanism not require a basic component design having a substantial stress concentration. Lightweight is also important in such high-speed rotating equipment and, accordingly, a lightweight, simply construed secondary locking mechanism is desired. Efforts have been made to improve external secondary locking mechanisms in aerospace applications and one example is shown in United States Patent No.
5,350,201, entitled SEPARABLE CONNECTOR EXTERNAL CAPTURE
DEVICE and issued to K. K. Bynum on September 27, 1994.
Bynum describes an external capture device having two co-axial spring clips sized to tightly grip the external surfaces of the separable connector to be secured. Each clip is a semi-circular spring band and serrated in form and joined by an axial bar. In another example, Dimmick III et al. describe in United States Patent No. 4,887,949, which is entitled BOLT RETENTION APPARATUS
TECHNICAL FIELD
The invention relates to fastening mechanisms and, in particular, to external secondary locking mechanisms to prevent the relative rotation and loosening of various separable connectors or fasteners, most commonly threaded connectors or fasteners.
BACKGROUND OF THE INVENTION
The secondary locking mechanisms to prevent the relative rotation and loosening of various separable connectors or fasteners have been developed over a long period of time, and different types of mechanisms have been created for various applications. In aerospace applications, anti-rotation features are important and external secondary locking mechanisms are widely used in different structures. In an assembly of rotating equipment such as gas turbine engine fans, for example, there are occasions where blind assembly of bolts would be required. In such situations, the head of the bolt cannot be reached at the time that components to be joined are installed, when applying a nut, or when tightening a nut. Various clips and retaining means are known to retain a bolt at such time. In other situations, external secondary locking mechanisms are used for locking connectors that join tubes, hoses and wiring together or to an accessory unit. The requirements for aerospace applications are particularly stringent, in particular, for use on engines, hydraulic systems, fuel systems and electrical cable connectors.
The current and most common means for secondary locking of aerospace connectors or fasteners are lock wires and safety wires which require special features to be incorporated in the connectors or fasteners. Other means comprise crimp nuts, fibre nuts and tab washers. These external locking devices may permit some small relative rotation of the connectors or fasteners, and usually are destroyed or rendered non-reusable in aerospace applications, once unlocked to open the connectors or unfasten the fasteners.
With high speed rotating equipment, high stresses are formed and notches, scratches or plastic deformation forms stress concentrations. Any such stress concentration can cause failure during the operation of the apparatus. It is therefore desirable that any external secondary locking mechanism not require a basic component design having a substantial stress concentration. Lightweight is also important in such high-speed rotating equipment and, accordingly, a lightweight, simply construed secondary locking mechanism is desired. Efforts have been made to improve external secondary locking mechanisms in aerospace applications and one example is shown in United States Patent No.
5,350,201, entitled SEPARABLE CONNECTOR EXTERNAL CAPTURE
DEVICE and issued to K. K. Bynum on September 27, 1994.
Bynum describes an external capture device having two co-axial spring clips sized to tightly grip the external surfaces of the separable connector to be secured. Each clip is a semi-circular spring band and serrated in form and joined by an axial bar. In another example, Dimmick III et al. describe in United States Patent No. 4,887,949, which is entitled BOLT RETENTION APPARATUS
and issued on December 19, 1989, a retention clip co-operating with a bolt and a flange through which the bolt passes to retain the bolt during blind assembly.
StJMlARY OF THE INVENTION
One object of the invention is to provide an anti-rotation clip which is simply constructed and easy for use.
Another object of the invention is to provide an anti-rotation clip which can be used for two or more separable connectors or fasteners in an assembly to prevent the same from rotation relative to one another or to a body which supports the connectors or fasteners.
In accordance with one aspect of the invention, there is provided an anti-rotation clip device which comprises:
at least one clip made of a spring band forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180 , adapted to radially and forcibly grip a polyhedral element on a first object when the clip is laterally and forcibly fitted onto the polyhedral element, through the circumferentially open portion of the clip and the clip having a first tang member fixed to the clip, the tang member including a laterally and inwardly facing surface adapted to abut a flat surface on a body to which the first object is rotatable so that the relative rotation between the first object and the body is prevented.
The first tang member preferably extends from the spring band and a flat end of the tang member is adapted to be received in a groove having a flat bottom on the body to prevent the first object from rotation and the device from axial movement relative to the body.
In an embodiment of the invention, it is preferred that the spring band include a second tang member which is similar to the first tang member and diametrically opposed to the first tang member, and adapted to engage a second groove having a flat bottom on the body to ensure the prevention of the object from rotation and the device from axial movement relative to the body.
In another embodiment of the invention, the anti-rotation clip device includes two spaced apart clips co-axial about a common axis. Each of the clips is a circumferentially discontinuous annulus, forming a circumferentially open portion of the clip less than 180 . A polyhedral element on either one of two objects in an assembly can be laterally and forcibly captured through the open portion of a corresponding one of the clips, and each clip is enabled to radially and forcibly grip the polyhedral element. Each clip is made of a spring band with two ends bent outwardly to facilitate the insertion of the polyhedral element of the object. A connection bar formed integrally with the spring bands rigidly interconnects the two clips at their middle portions so that relative rotary and linear movement between the two clips are restrained. Two tang members fixed to and axially spaced apart from one of the open clips are diametrically opposed and symmetrical about the connection bar. Each tang member includes a surface adapted to abut a flat surface on a body to which the respective objects are rotatable relative so that the relative rotation between each object and the body is prevented. Furthermore, two sides of each tang member are adapted to co-operate with two corresponding surfaces on the body to prevent the device from axial movement relative to the body.
StJMlARY OF THE INVENTION
One object of the invention is to provide an anti-rotation clip which is simply constructed and easy for use.
Another object of the invention is to provide an anti-rotation clip which can be used for two or more separable connectors or fasteners in an assembly to prevent the same from rotation relative to one another or to a body which supports the connectors or fasteners.
In accordance with one aspect of the invention, there is provided an anti-rotation clip device which comprises:
at least one clip made of a spring band forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180 , adapted to radially and forcibly grip a polyhedral element on a first object when the clip is laterally and forcibly fitted onto the polyhedral element, through the circumferentially open portion of the clip and the clip having a first tang member fixed to the clip, the tang member including a laterally and inwardly facing surface adapted to abut a flat surface on a body to which the first object is rotatable so that the relative rotation between the first object and the body is prevented.
The first tang member preferably extends from the spring band and a flat end of the tang member is adapted to be received in a groove having a flat bottom on the body to prevent the first object from rotation and the device from axial movement relative to the body.
In an embodiment of the invention, it is preferred that the spring band include a second tang member which is similar to the first tang member and diametrically opposed to the first tang member, and adapted to engage a second groove having a flat bottom on the body to ensure the prevention of the object from rotation and the device from axial movement relative to the body.
In another embodiment of the invention, the anti-rotation clip device includes two spaced apart clips co-axial about a common axis. Each of the clips is a circumferentially discontinuous annulus, forming a circumferentially open portion of the clip less than 180 . A polyhedral element on either one of two objects in an assembly can be laterally and forcibly captured through the open portion of a corresponding one of the clips, and each clip is enabled to radially and forcibly grip the polyhedral element. Each clip is made of a spring band with two ends bent outwardly to facilitate the insertion of the polyhedral element of the object. A connection bar formed integrally with the spring bands rigidly interconnects the two clips at their middle portions so that relative rotary and linear movement between the two clips are restrained. Two tang members fixed to and axially spaced apart from one of the open clips are diametrically opposed and symmetrical about the connection bar. Each tang member includes a surface adapted to abut a flat surface on a body to which the respective objects are rotatable relative so that the relative rotation between each object and the body is prevented. Furthermore, two sides of each tang member are adapted to co-operate with two corresponding surfaces on the body to prevent the device from axial movement relative to the body.
5 In accordance with another aspect of the invention, an anti-rotation clip includes at least two spaced-apart clips co-axial about a common axis, each clip being a circumferentially discontinuous annulus, forming a circumferentially open portion less than 1800. A
polyhedral element on either one of two objects which are threadedly connected to a body respectively can be laterally and forcibly captured through the open portion of a corresponding one of the clips. Each clip therefore is enabled to radially and forcibly grip the polyhedral element. Each clip is made of a spring band with two ends bent outwardly to facilitate the forcible insertion of the polyhedral element on the object. A connection bar formed integrally with the spring bands rigidly interconnects the two clips at their middle portions to restrain relative rotary and linear movements between the two clips so that the two objects which are rotatable relative to each other are prevented from relative rotation when they are forcibly gripped by the respective clips. At least one pair of axially spaced apart tang members are fixed to either side of the connection bar between the two clips and enabled to axially restrain within a space therebetween a flange member on the body so that the device is prevented from axial movement relative to the objects.
No special tools are required for the anti-rotation clip device to be added to or removed from a closed connector, or a fastener assembly. The secure attachment of the clip device is ensured by the resilient force.
There is no plastic deformation of any part of the device during installation, which renders the device a re-usable feature and avoids failure resulted from stress concentration. Other features and advantages will be more clear in the detailed description of the embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the nature of the invention, reference will now be made to the preferred embodiments thereof and the accompanying drawings, shown by way of illustration, in which:
FIG. la is a perspective view of a single anti-rotation clip according to a preferred embodiment of the invention which is attached to a fastener assembly;
FIG. lb is a perspective view of the embodiment in FIG. la, showing the structural detail thereof;
FIG. 2 is an exploded perspective view of a double anti-rotation clip according to another preferred embodiment of the invention, which is to be attached to a connector assembly;
FIG. 3a is a gang anti-rotation clip according to a further preferred embodiment of the invention, which is attached to a connector assembly;
FIG. 3b is a perspective view of the embodiment in FIG. 3a, showing the structural detail thereof.
polyhedral element on either one of two objects which are threadedly connected to a body respectively can be laterally and forcibly captured through the open portion of a corresponding one of the clips. Each clip therefore is enabled to radially and forcibly grip the polyhedral element. Each clip is made of a spring band with two ends bent outwardly to facilitate the forcible insertion of the polyhedral element on the object. A connection bar formed integrally with the spring bands rigidly interconnects the two clips at their middle portions to restrain relative rotary and linear movements between the two clips so that the two objects which are rotatable relative to each other are prevented from relative rotation when they are forcibly gripped by the respective clips. At least one pair of axially spaced apart tang members are fixed to either side of the connection bar between the two clips and enabled to axially restrain within a space therebetween a flange member on the body so that the device is prevented from axial movement relative to the objects.
No special tools are required for the anti-rotation clip device to be added to or removed from a closed connector, or a fastener assembly. The secure attachment of the clip device is ensured by the resilient force.
There is no plastic deformation of any part of the device during installation, which renders the device a re-usable feature and avoids failure resulted from stress concentration. Other features and advantages will be more clear in the detailed description of the embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the nature of the invention, reference will now be made to the preferred embodiments thereof and the accompanying drawings, shown by way of illustration, in which:
FIG. la is a perspective view of a single anti-rotation clip according to a preferred embodiment of the invention which is attached to a fastener assembly;
FIG. lb is a perspective view of the embodiment in FIG. la, showing the structural detail thereof;
FIG. 2 is an exploded perspective view of a double anti-rotation clip according to another preferred embodiment of the invention, which is to be attached to a connector assembly;
FIG. 3a is a gang anti-rotation clip according to a further preferred embodiment of the invention, which is attached to a connector assembly;
FIG. 3b is a perspective view of the embodiment in FIG. 3a, showing the structural detail thereof.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Illustrated in FIG. la, is a fastener assembly 10 which includes a body portion 12 having a central threaded bore (not shown) for receiving a bolt 14 in threaded connection. The bolt 14 includes a hexagonal head portion 16 which is radially and forcibly gripped by a single anti-rotation clip 20 and the anti-rotation clip 20 itself is restrained by two grooves 18 (only one is shown) on the body portion 12 so that the rotation of the bolt 14 relative to the body portion 12 is prevented.
The fastener assembly 10 could be a connector joint assembly in which the body portion might be a casing or a base portion, and the bolt 14 might be a fitting with an hexagonal exterior portion. This is immaterial to the application of the single anti-rotation clip 20, and is an example only for illustration of the application of the anti-rotation clip 20.
The single anti-rotation clip 20 is more clearly shown in FIG. lb. The single anti-rotation clip 20 includes a clip made of a spring band 22 forming a circumferentially discontinuous annulus with a circumferentially open portion 24 less than 180 . The spring band 22 is radially sized to engage the hexagonal head portion 16 of the bolt 14 and enabled to radially and forcibly grip the hexagonal head portion 16 when the hexagonal head portion 16 of the bolt 14 is laterally and forcibly inserted through the open portion 24 into engagement within the clip 20. The radial spring force applied by the spring band 22 to the hexagonal head portion 16 of the bolt 14 tightly holds the bolt 14 and restrains the rotation of the bolt with respect to the clip 20. The two ends 26 of the spring band 22 are bent outwardly to facilitate the insertion of the hexagonal head portion 16 of the bolt 14.
Two tang members 28 integrally extend from one side of the spring band 22. The tang members 28 are diametrically opposed, and circumferentially and equally spaced apart from the two respective bent ends 26. Each tang member 28 smoothly extends outwardly and then inwardly to form a hook with a flat end 30 which is axially spaced apart from the spring band 22 and extends towards its counterpart. The two flat ends 30 of the tang members 28 slide into the respective grooves 18 on the body portion 12 when the hexagonal head portion 16 of the bolt 14 is inserted through the open portion 24 into the clip 20. The flat end 30 abuts a flat bottom of the groove 18 to restrain the clip 20 from rotation relative to the body portion 12 and, therefore, the rotation of the bolt 14 relative to the body portion 12 is prevented.
The flat end 30 of the tang member 28 is also restrained by the side walls of the groove 18 in its axial position to prevent axially moving away from the assembly 10, which might be caused otherwise by vibration or impact during an operation condition of a machine, such as a turbine engine in which the assembly 10 is installed.
The single anti-rotation clip can be used to lock a tightened connector or fastener assembly as well as to retain a bolt in blind assembly as described in United States Patent No. 4,887,949.
Illustrated in FIG. 2 is a connector joint assembly 40 typically used in the aircraft industry. The connector joint assembly 40 includes a first hexagonal portion 42, a second hexagonal portion 44 and a body portion 46 which are rotatable relative to one another and form a threaded joint to retain a first tube 48 and second tube 50 tightly together. Although fully and properly tightened, such a connector joint assembly 40 can inevidently loosen as a result of severe vibration or impact. The connector joint assembly 40 may also be routinely opened and re-tightened during maintenance procedures. Therefore, a double anti-rotation clip 52 is to be attached to the connector joint assQmbly 40 to ensure the tightened connection. A pair of grooves 54, only one shown, are provided on the body portion 46 to engage the double anti-rotation clip 52.
The double anti-rotation clip 52 includes two open and spaced-apart clips made of a spring band 54 and 56, and each is a circumferentially discontinuous annulus having a circumferentially open portion 58 and 60 less than 180 . The spring bands 54 and 56 are co-axial about a common axis and the open portion 58 and 60 are oriented in the same direction so that the first and second hexagonal portion 42 and 44 are enabled to be laterally and forcibly inserted through the respective open portions 58 and 60 into the two clips. The spring bands 54 and 56 are radially sized to the respective first and second hexagonal portion 42 and 44 and enabled to radially and forcibly grip the first and second hexagonal portions 42 and 44. The radial spring force applied by the spring bands 54 and 56 to the respective first and second hexagonal portion 42 and 44 tightly holds the first and second hexagonal portions 42 and 44 in position and the rotation thereof respective to the clips are prevented, as described in the embodiment shown in FIGs. la, and lb.
Each of the spring band 54 and 56 includes two ends 62, 64 outwardly bent to facilitate the insertion of 5 the first and second hexagonal portions 42 and 44. A
connection bar 66 is integrally formed with the spring bands 54 and 56 to rigidly interconnect the two open clips at their middle portions so that relative rotary and linear movement between the two clips are restrained.
Illustrated in FIG. la, is a fastener assembly 10 which includes a body portion 12 having a central threaded bore (not shown) for receiving a bolt 14 in threaded connection. The bolt 14 includes a hexagonal head portion 16 which is radially and forcibly gripped by a single anti-rotation clip 20 and the anti-rotation clip 20 itself is restrained by two grooves 18 (only one is shown) on the body portion 12 so that the rotation of the bolt 14 relative to the body portion 12 is prevented.
The fastener assembly 10 could be a connector joint assembly in which the body portion might be a casing or a base portion, and the bolt 14 might be a fitting with an hexagonal exterior portion. This is immaterial to the application of the single anti-rotation clip 20, and is an example only for illustration of the application of the anti-rotation clip 20.
The single anti-rotation clip 20 is more clearly shown in FIG. lb. The single anti-rotation clip 20 includes a clip made of a spring band 22 forming a circumferentially discontinuous annulus with a circumferentially open portion 24 less than 180 . The spring band 22 is radially sized to engage the hexagonal head portion 16 of the bolt 14 and enabled to radially and forcibly grip the hexagonal head portion 16 when the hexagonal head portion 16 of the bolt 14 is laterally and forcibly inserted through the open portion 24 into engagement within the clip 20. The radial spring force applied by the spring band 22 to the hexagonal head portion 16 of the bolt 14 tightly holds the bolt 14 and restrains the rotation of the bolt with respect to the clip 20. The two ends 26 of the spring band 22 are bent outwardly to facilitate the insertion of the hexagonal head portion 16 of the bolt 14.
Two tang members 28 integrally extend from one side of the spring band 22. The tang members 28 are diametrically opposed, and circumferentially and equally spaced apart from the two respective bent ends 26. Each tang member 28 smoothly extends outwardly and then inwardly to form a hook with a flat end 30 which is axially spaced apart from the spring band 22 and extends towards its counterpart. The two flat ends 30 of the tang members 28 slide into the respective grooves 18 on the body portion 12 when the hexagonal head portion 16 of the bolt 14 is inserted through the open portion 24 into the clip 20. The flat end 30 abuts a flat bottom of the groove 18 to restrain the clip 20 from rotation relative to the body portion 12 and, therefore, the rotation of the bolt 14 relative to the body portion 12 is prevented.
The flat end 30 of the tang member 28 is also restrained by the side walls of the groove 18 in its axial position to prevent axially moving away from the assembly 10, which might be caused otherwise by vibration or impact during an operation condition of a machine, such as a turbine engine in which the assembly 10 is installed.
The single anti-rotation clip can be used to lock a tightened connector or fastener assembly as well as to retain a bolt in blind assembly as described in United States Patent No. 4,887,949.
Illustrated in FIG. 2 is a connector joint assembly 40 typically used in the aircraft industry. The connector joint assembly 40 includes a first hexagonal portion 42, a second hexagonal portion 44 and a body portion 46 which are rotatable relative to one another and form a threaded joint to retain a first tube 48 and second tube 50 tightly together. Although fully and properly tightened, such a connector joint assembly 40 can inevidently loosen as a result of severe vibration or impact. The connector joint assembly 40 may also be routinely opened and re-tightened during maintenance procedures. Therefore, a double anti-rotation clip 52 is to be attached to the connector joint assQmbly 40 to ensure the tightened connection. A pair of grooves 54, only one shown, are provided on the body portion 46 to engage the double anti-rotation clip 52.
The double anti-rotation clip 52 includes two open and spaced-apart clips made of a spring band 54 and 56, and each is a circumferentially discontinuous annulus having a circumferentially open portion 58 and 60 less than 180 . The spring bands 54 and 56 are co-axial about a common axis and the open portion 58 and 60 are oriented in the same direction so that the first and second hexagonal portion 42 and 44 are enabled to be laterally and forcibly inserted through the respective open portions 58 and 60 into the two clips. The spring bands 54 and 56 are radially sized to the respective first and second hexagonal portion 42 and 44 and enabled to radially and forcibly grip the first and second hexagonal portions 42 and 44. The radial spring force applied by the spring bands 54 and 56 to the respective first and second hexagonal portion 42 and 44 tightly holds the first and second hexagonal portions 42 and 44 in position and the rotation thereof respective to the clips are prevented, as described in the embodiment shown in FIGs. la, and lb.
Each of the spring band 54 and 56 includes two ends 62, 64 outwardly bent to facilitate the insertion of 5 the first and second hexagonal portions 42 and 44. A
connection bar 66 is integrally formed with the spring bands 54 and 56 to rigidly interconnect the two open clips at their middle portions so that relative rotary and linear movement between the two clips are restrained.
10 The connection bar has an appropriate length to enable the two spring bands 54 and 56 to be axially spaced apart in accordance with the space between the first and second hexagonal portions 42 and 44. The width of the connection bar is substantially the same as the width of each spring band 54, 56.
A pair of tang members 68 are fixed to the outer side of the spring band 56, which is exactly identical in structure and function to the tang members 28 of the embodiment in FIGs. la and lb. In order to avoid redundancy, the tang members 68 are not described with detail. However, it is apparent to those skilled in the art that the rotation of either or both of the first and second hexagonal portions 42 and 44 relative to the body portion 46 is prevented when the first and second hexagonal portions 42 and 44 are radially and forcibly gripped by the respective spring bands 54 and 56, and the tang member 68 is engaged in the flat-bottomed grooves 54 on the body portion 46. The double anti-rotation clip 52 itself is prevented from axially moving away from the connector joint assembly 40 by the tang members 68 engaged in the grooves 54.
A pair of tang members 68 are fixed to the outer side of the spring band 56, which is exactly identical in structure and function to the tang members 28 of the embodiment in FIGs. la and lb. In order to avoid redundancy, the tang members 68 are not described with detail. However, it is apparent to those skilled in the art that the rotation of either or both of the first and second hexagonal portions 42 and 44 relative to the body portion 46 is prevented when the first and second hexagonal portions 42 and 44 are radially and forcibly gripped by the respective spring bands 54 and 56, and the tang member 68 is engaged in the flat-bottomed grooves 54 on the body portion 46. The double anti-rotation clip 52 itself is prevented from axially moving away from the connector joint assembly 40 by the tang members 68 engaged in the grooves 54.
In FIG. 3a, another type of connector joint assembly 70 used in the aircraft industry is illustrated.
The connector joint assembly 70 includes a first sleeve portion 72 and a second sleeve portion 74, and each of the sleeve portions 72, 74, has a hexagonal exterior portion 76, 78, suitable for engagement by a wrench to tighten or loosen the connector. A hollow body 80 surrounded by a hexagonal nut 82 is threadedly connected at each end to the first and second sleeve portions 76, 78 to tightly hold a first tube 84 and a second tube 86 together. The hexagonal nut 82 is fixed to the hollow body 80 so that when the nut 82 is held by a wrench, the first or second sleeve portion 72 or 74 can be rotated to be tightened or loosened by another wrench engaging the hexagonal exterior portion 76 or 78. A gang anti-rotation clip 88 is attached to the connector joint assembly 70 to ensure the tightened engagement of the assembly, preventing either one of the sleeve portions 72, 74 from rotation relative to the hollow body 80.
The gang anti-rotation clip 88 is now described with reference to FIG. 3b. Similar to the second embodiment, the double anti-rotation clip 52, the gang anti-rotation clip 88 includes two clips, and each is made of a spring band 90, 92 forming a circumferentially discontinuous annulus having a circumferentially open portion 94, 96 less than 180 . The two spring bands 90 and 92, co-axial about a common axis, are axially spaced-apart from each other and rigidly connected by a connection bar 98 which extends from the middle portion of the spring band 90 to the middle portion of the spring band 92. Therefore, the two clips are substantially prevented from relative rotary and linear movement. The length of the connection bar 98 is substantially equal to the distance between the two hexagonal exterior portions 76, 78 and the open portions 94, 96 are oriented in the same direction to enable the two hexagonal exterior portions 76, 78 to be laterally and forcibly inserted through the open portions 94, 96 into the clips. Each of the spring bands 90, 92 has two ends bent outwardly to facilitate the insertion.
The spring bands 90, 92 are radially sized to the corresponding hexagonal exterior portion 76, 78 so that the spring bands 90, 92 radially and forcibly grip the respective hexagonal exterior portions 76, 78 to prevent the sleeve portions 72 and 74 from rotation relative to the gang anti-rotation clip 88. In order to prevent the tang anti-rotation clip 88 from axial displacement with respect to the hexagonal exterior portions 76, 78, two pair of integral tang members 104 and 106 are provided.
The two tang members 104 extend radially and inwardly from one side of the connection bar 98, and are axially spaced apart from each other. The space between the tang members 104 and the axial position thereof match the geometry of the connector joint assembly 88 to enable the hexagonal nut 82 to fit into the space between the two tang members 104. The other pair of tang members 106 are similar to the tang members 104, and extend from the opposite side of the connection bar 98.
Having thus structured, the tang members 104, 106 do not restrain the rotation of the gang anti-rotation clip 88 relative to the body portion 80 and the hexagonal nut 82, and the first and second sleeve portions 72, 74 may rotate together with the gang anti-rotation clip 88 relative to the body portion 80 and the hexagonal nut 82.
However, in practical applications, this does not happen.
Each of the sleeve portions 72 and 74 is tightened in threaded connection to the hollow body portion 80, and able to be rotated relative to the body portion 80 in one direction only to loosen the connection. The rotary direction of the.sleeve portion 72 for loosening the threaded connection is opposite to the rotary direction of the sleeve portion 74 for loosening the threaded connection.
Therefore, when the gang anti-rotation clip 88 is attached to the connector joint assembly 70, the rotation of the sleeve 72 for loosening the threaded connection will cause the sleeve portion 74 to rotate for further tightening of the threaded connection. The rotation for further tightening the sleeve portion 74 could not happen and, therefore, the rotation of the sleeve portion 72 for loosening the threaded connection is stopped.
The invention is illustrated by three preferred embodiments as examples only and is not limited to the described embodiments. For example, three or more clips may be included in the embodiments described as the double-rotation clip or gang anti-rotation clip, depending on various applications.
Any changes or modifications to the embodiments hereinbefore described can be made without departing from the scope of the invention which is intended solely by the scope of the appended claims.
The connector joint assembly 70 includes a first sleeve portion 72 and a second sleeve portion 74, and each of the sleeve portions 72, 74, has a hexagonal exterior portion 76, 78, suitable for engagement by a wrench to tighten or loosen the connector. A hollow body 80 surrounded by a hexagonal nut 82 is threadedly connected at each end to the first and second sleeve portions 76, 78 to tightly hold a first tube 84 and a second tube 86 together. The hexagonal nut 82 is fixed to the hollow body 80 so that when the nut 82 is held by a wrench, the first or second sleeve portion 72 or 74 can be rotated to be tightened or loosened by another wrench engaging the hexagonal exterior portion 76 or 78. A gang anti-rotation clip 88 is attached to the connector joint assembly 70 to ensure the tightened engagement of the assembly, preventing either one of the sleeve portions 72, 74 from rotation relative to the hollow body 80.
The gang anti-rotation clip 88 is now described with reference to FIG. 3b. Similar to the second embodiment, the double anti-rotation clip 52, the gang anti-rotation clip 88 includes two clips, and each is made of a spring band 90, 92 forming a circumferentially discontinuous annulus having a circumferentially open portion 94, 96 less than 180 . The two spring bands 90 and 92, co-axial about a common axis, are axially spaced-apart from each other and rigidly connected by a connection bar 98 which extends from the middle portion of the spring band 90 to the middle portion of the spring band 92. Therefore, the two clips are substantially prevented from relative rotary and linear movement. The length of the connection bar 98 is substantially equal to the distance between the two hexagonal exterior portions 76, 78 and the open portions 94, 96 are oriented in the same direction to enable the two hexagonal exterior portions 76, 78 to be laterally and forcibly inserted through the open portions 94, 96 into the clips. Each of the spring bands 90, 92 has two ends bent outwardly to facilitate the insertion.
The spring bands 90, 92 are radially sized to the corresponding hexagonal exterior portion 76, 78 so that the spring bands 90, 92 radially and forcibly grip the respective hexagonal exterior portions 76, 78 to prevent the sleeve portions 72 and 74 from rotation relative to the gang anti-rotation clip 88. In order to prevent the tang anti-rotation clip 88 from axial displacement with respect to the hexagonal exterior portions 76, 78, two pair of integral tang members 104 and 106 are provided.
The two tang members 104 extend radially and inwardly from one side of the connection bar 98, and are axially spaced apart from each other. The space between the tang members 104 and the axial position thereof match the geometry of the connector joint assembly 88 to enable the hexagonal nut 82 to fit into the space between the two tang members 104. The other pair of tang members 106 are similar to the tang members 104, and extend from the opposite side of the connection bar 98.
Having thus structured, the tang members 104, 106 do not restrain the rotation of the gang anti-rotation clip 88 relative to the body portion 80 and the hexagonal nut 82, and the first and second sleeve portions 72, 74 may rotate together with the gang anti-rotation clip 88 relative to the body portion 80 and the hexagonal nut 82.
However, in practical applications, this does not happen.
Each of the sleeve portions 72 and 74 is tightened in threaded connection to the hollow body portion 80, and able to be rotated relative to the body portion 80 in one direction only to loosen the connection. The rotary direction of the.sleeve portion 72 for loosening the threaded connection is opposite to the rotary direction of the sleeve portion 74 for loosening the threaded connection.
Therefore, when the gang anti-rotation clip 88 is attached to the connector joint assembly 70, the rotation of the sleeve 72 for loosening the threaded connection will cause the sleeve portion 74 to rotate for further tightening of the threaded connection. The rotation for further tightening the sleeve portion 74 could not happen and, therefore, the rotation of the sleeve portion 72 for loosening the threaded connection is stopped.
The invention is illustrated by three preferred embodiments as examples only and is not limited to the described embodiments. For example, three or more clips may be included in the embodiments described as the double-rotation clip or gang anti-rotation clip, depending on various applications.
Any changes or modifications to the embodiments hereinbefore described can be made without departing from the scope of the invention which is intended solely by the scope of the appended claims.
Claims (16)
1. An anti-rotation clip device comprising:
at least one clip made of a spring band forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180°, adapted to radially and forcibly grip a polyhedral element on a first object when the polyhedral element is laterally and forcibly captured therein through the circumferentially open portion of the clip; and a first tang member fixed to the clip, the tang member including a laterally and inwardly facing surface adapted to abut a flat surface on a body to which the first object is rotatable relative so that the relative rotation between the first object and the body is prevented.
at least one clip made of a spring band forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180°, adapted to radially and forcibly grip a polyhedral element on a first object when the polyhedral element is laterally and forcibly captured therein through the circumferentially open portion of the clip; and a first tang member fixed to the clip, the tang member including a laterally and inwardly facing surface adapted to abut a flat surface on a body to which the first object is rotatable relative so that the relative rotation between the first object and the body is prevented.
2. An anti-rotation clip device as claimed in claim 1 wherein the first tang member extends from the spring band, and a flat end of the tang member is axially spaced apart from the clip and adapted to be received in a groove having a flat bottom on the body to prevent the first object from rotation and the device from axial movement relative to the body.
3. An anti-rotation clip device as claimed in claim 2 wherein the spring band includes a second tang member which is similar to the first tang member and diametrically opposed to the first tang member, adapted to engage a second groove having a flat bottom on the body to ensure the prevention of the first object from rotation and the device from axial movement relative to the body.
4. An anti-rotation clip device as claimed in claim 3 wherein the spring band includes two ends bent outwardly adapted to facilitate the lateral and forcible insertion of the polyhedral element on the first object through the circumferential open portion of the clip.
5. An anti-rotation clip device as claimed in claim 4 wherein the first and second tang members are circumferentially equally spaced apart from the respective bent ends of the spring band.
6. An anti-rotation clip device as claimed in claim 1 comprising a second clip made of a spring band forming a circumferentially discontinuous annulus having a circumferentially open portion less than 180°, the second clip being connected in fixed relation with and axially spaced apart from the at least one clip, and co-axial about a common axis with the at least one clip, adapted to radially and forcibly grip a polyhedral element on a second object which is rotatable relative to the body when the polyhedral element is laterally and forcibly captured therein through the open portion of the second clip so that the rotation of the second object relative to the body is prevented.
7. An anti-rotation clip device as claimed in claim 6 wherein a connection bar extends between the two spring bands at their middle portions to interconnect the two clips.
8. An anti-rotation clip device as claimed in claim 7 where in the two circumferentially discontinuous annuluses of the spring bands are individually and radially sized to the polydrical element of the respective first and second objects.
9. An anti-rotation clip device as claimed in claim 8 wherein the spring band of the respective at least one and second clips and the connection bar have a width substantially the same.
10. An anti-rotation clip device as claimed in claim 9 wherein the at least one clip includes a second tang member which is similar to the first tang member and diametrically opposed to the first tang member, adapted to engage a groove having a flat bottom on the body to ensure the prevention of the first and second objects from rotation and the device from axial movement relative to the body.
11. An anti-rotation clip device as claimed in claim 10 wherein the clips, the tang members and the connection bar are made integrally.
12. An anti-rotation clip device comprising:
at least two spaced apart clips co-axial about a common axis, each clip forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180°, adapted to radially and forcibly grip a polyhedral element on a corresponding one of a first and a second objects when both the polyhedral elements of the first and second objects are laterally and forcibly captured through the respective open portions of the clips, and each clip being made of a spring band with ends bent outwardly to facilitate the insertion of the polyhedral element of the object;
a connection bar formed integrally with the spring bands rigidly interconnecting the two clips at their middle portions so that relative rotary and leaner movement between the two clips are restrained; and a pair of tang members fixed to and axially spaced apart from either one of the clips, the tang members being diametrically opposed and symmetrical about the connection bar, each tang member including a surface adapted to abut a flat surface on a body to which the first and second objects are rotatable relative so that the relative rotation between each of the objects and the body is prevented, two sides of each tang member being adapted to cooperate with two corresponding surfaces on the body to prevent the device from axial movement relative the body.
at least two spaced apart clips co-axial about a common axis, each clip forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180°, adapted to radially and forcibly grip a polyhedral element on a corresponding one of a first and a second objects when both the polyhedral elements of the first and second objects are laterally and forcibly captured through the respective open portions of the clips, and each clip being made of a spring band with ends bent outwardly to facilitate the insertion of the polyhedral element of the object;
a connection bar formed integrally with the spring bands rigidly interconnecting the two clips at their middle portions so that relative rotary and leaner movement between the two clips are restrained; and a pair of tang members fixed to and axially spaced apart from either one of the clips, the tang members being diametrically opposed and symmetrical about the connection bar, each tang member including a surface adapted to abut a flat surface on a body to which the first and second objects are rotatable relative so that the relative rotation between each of the objects and the body is prevented, two sides of each tang member being adapted to cooperate with two corresponding surfaces on the body to prevent the device from axial movement relative the body.
13. An anti-rotation clip device as claimed in claim 12 wherein the tang members are formed integrally with the clip to which the tang members are fixed.
14. An anti-rotation clip member as claimed in claim 13 wherein the connection bar and the spring bands have a width substantially the same.
15. An anti-rotation clip member comprising:
at least two spaced apart clips co-axial about a common axis, each clip forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180°, adapted to radially and forcibly grip a polyhedral element on a corresponding one of two objects which are threadedly connected to a body respectively when both polyhedral elements are laterally and forcibly captured therein through the respective open portions of the clips, and each clip being made of a spring band with two ends bent outwardly to facilitate the insertion of the polyhedral element of the object;
a connection bar formed integrally with the spring bands rigidly interconnecting the two clips at their middle portions to restrain relative rotary and leaner movement between the two clips so that the two objects which are rotatable relative to each other are prevented from the relative rotation when they are forcibly griped by the respective clips; and at least one pair of axially spaced apart tang members fixed to either side of the connection bar between the two clips, adapted to axially restrain within a space therebetween a flange member on the body so that the device is prevented from axial movement relative to the objects.
at least two spaced apart clips co-axial about a common axis, each clip forming a circumferentially discontinuous annulus having an circumferentially open portion less than 180°, adapted to radially and forcibly grip a polyhedral element on a corresponding one of two objects which are threadedly connected to a body respectively when both polyhedral elements are laterally and forcibly captured therein through the respective open portions of the clips, and each clip being made of a spring band with two ends bent outwardly to facilitate the insertion of the polyhedral element of the object;
a connection bar formed integrally with the spring bands rigidly interconnecting the two clips at their middle portions to restrain relative rotary and leaner movement between the two clips so that the two objects which are rotatable relative to each other are prevented from the relative rotation when they are forcibly griped by the respective clips; and at least one pair of axially spaced apart tang members fixed to either side of the connection bar between the two clips, adapted to axially restrain within a space therebetween a flange member on the body so that the device is prevented from axial movement relative to the objects.
16. An anti-rotation clip member as claimed in claim 15 comprising a second pair of axially spaced apart tang members fixed to the connection bar at a side opposite to the at least one pair of the tang members, for axially restraining the flange member within a space therebetween to ensure the prevention of the device from axial movement relative to the objects.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US09/444,311 US6322306B1 (en) | 1999-11-22 | 1999-11-22 | Anti-rotation clips |
| US09/444,311 | 1999-11-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2326274A1 CA2326274A1 (en) | 2001-05-22 |
| CA2326274C true CA2326274C (en) | 2008-07-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002326274A Expired - Lifetime CA2326274C (en) | 1999-11-22 | 2000-11-17 | Anti-rotation clips |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US6322306B1 (en) |
| CA (1) | CA2326274C (en) |
| GB (1) | GB2356436B (en) |
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| US20020071718A1 (en) * | 2000-10-17 | 2002-06-13 | Garry Marty | Retainer clip |
| DE10204262A1 (en) * | 2002-02-02 | 2003-08-07 | Bauer Christian Gmbh & Co | U-shaped spring clip for flange connections |
| US6971381B2 (en) * | 2003-01-17 | 2005-12-06 | Stanley C. Langford | Actuation inhibitor for metered dose inhalers |
| US20050271494A1 (en) * | 2004-06-02 | 2005-12-08 | Honeywell International Inc. | Anti-rotation spring clip |
| DE202005002159U1 (en) * | 2005-02-10 | 2005-08-25 | Veritas Ag | coupling device |
| FR2906586B1 (en) * | 2006-09-29 | 2013-07-05 | Joubert Productions | UNIVERSAL FASTENING TIP AND FASTENING ASSEMBLY COMPRISING SUCH A TIP |
| US20090151144A1 (en) * | 2007-12-12 | 2009-06-18 | Bittner Edward H | Method for removing hardware pressed into a bore |
| US8092132B2 (en) * | 2008-12-05 | 2012-01-10 | American Axle & Manufacturing, Inc. | Fastener with anti-rotation clip |
| US9033631B2 (en) | 2009-04-17 | 2015-05-19 | United Technologies Corporation | High temperature thread locking compound |
| DE102010061837B4 (en) * | 2010-11-24 | 2016-02-25 | Geze Gmbh | Valve for driving a door or a window |
| JP5822272B2 (en) * | 2012-02-27 | 2015-11-24 | 株式会社ケーヒン | Support structure for fuel injection valve |
| JP5822271B2 (en) * | 2012-02-27 | 2015-11-24 | 株式会社ケーヒン | Support structure for fuel injection valve |
| US8967978B2 (en) * | 2012-07-26 | 2015-03-03 | Pratt & Whitney Canada Corp. | Axial retention for fasteners in fan joint |
| US9004871B2 (en) | 2012-08-17 | 2015-04-14 | General Electric Company | Stacked wheel assembly for a turbine system and method of assembling |
| US9945411B2 (en) * | 2012-08-31 | 2018-04-17 | United Technologies Corporation | Self-anti-rotating dual lock washer |
| US9708933B2 (en) * | 2014-06-05 | 2017-07-18 | United Technologies Corporation | Plug assembly with retaining element |
| CN104454915B (en) * | 2014-12-19 | 2016-08-17 | 苏州中拓专利运营管理有限公司 | A kind of check bolt |
| US10759633B2 (en) * | 2015-03-05 | 2020-09-01 | The Crosby Group LLC | Rotating eye bolt assembly with lock mechanism |
| US10151352B2 (en) * | 2015-11-20 | 2018-12-11 | GM Global Technology Operations LLC | Shaft retention apparatus |
| USD869554S1 (en) * | 2018-04-10 | 2019-12-10 | GCK Products, LLC | Clip for bundled articles |
| US11428104B2 (en) | 2019-07-29 | 2022-08-30 | Pratt & Whitney Canada Corp. | Partition arrangement for gas turbine engine and method |
| CN115848420B (en) * | 2023-02-21 | 2023-05-05 | 四川工程职业技术学院 | Sightseeing cable car protection machanism and sightseeing cable car |
| US12467386B2 (en) * | 2023-03-06 | 2025-11-11 | Pratt & Whitney Canada Corp. | Mechanical dissuasion device for a fluid assembly joint |
| CN116877798A (en) * | 2023-07-07 | 2023-10-13 | 江苏南大光电材料股份有限公司 | Lock |
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| US339758A (en) | 1886-04-13 | Nut-lock | ||
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| US408320A (en) * | 1889-08-06 | Cock or valve | ||
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-
1999
- 1999-11-22 US US09/444,311 patent/US6322306B1/en not_active Expired - Fee Related
-
2000
- 2000-11-17 CA CA002326274A patent/CA2326274C/en not_active Expired - Lifetime
- 2000-11-21 GB GB0028358A patent/GB2356436B/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2326274A1 (en) | 2001-05-22 |
| GB2356436B (en) | 2003-07-02 |
| US6322306B1 (en) | 2001-11-27 |
| GB0028358D0 (en) | 2001-01-03 |
| GB2356436A (en) | 2001-05-23 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20201117 |